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#
include
"
track.h
"
#
include
<
QAudioDecoder
>
Track::Track
(QWidget *parent)
: QCustomPlot(parent)
, decoder(
new
QAudioDecoder(
this
))
{
wavePlot =
addGraph
();
QBrush
FillBrush
(
QColor
(
100
,
100
,
100
));
this
->
setBackground
(FillBrush);
QPen
ThePen
(
QColor
(
127
,
255
,
0
));
wavePlot->
setPen
(ThePen);
wavePlot->
setBrush
(FillBrush);
yAxis->
setVisible
(
false
);
xAxis->
setVisible
(
false
);
//
add independent layer for playrect and labels so we don't replot the entire thing every time
addLayer
(
"
Playing
"
);
setCurrentLayer
(
"
Playing
"
);
layer
(
"
Playing
"
)->
setMode
(QCPLayer::LayerMode::lmBuffered);
PlayRect =
new
QCPItemRect
(
this
);
PlayRect->
topLeft
->
setType
(QCPItemPosition::ptViewportRatio);
PlayRect->
bottomRight
->
setType
(QCPItemPosition::ptViewportRatio);
QPen
RectPen
(
QColor
(
255
,
255
,
255
,
150
));
QBrush
RectBrush
(
QColor
(
200
,
200
,
200
,
75
));
RectPen.
setWidth
(
3
);
PlayRect->
topLeft
->
setCoords
(
0
,
0
);
PlayRect->
bottomRight
->
setCoords
(
1
,
1
);
PlayRect->
setPen
(RectPen);
PlayRect->
setBrush
(RectBrush);
timGenericTick =
new
QTimer
(
this
);
timGenericTick->
setInterval
(
10
);
timGenericTick->
setSingleShot
(
false
);
timEndTick =
new
QTimer
(
this
);
timEndTick->
setInterval
(
1000
);
timEndTick->
setSingleShot
(
false
);
connect
(timGenericTick,&QTimer::timeout,
this
,&Track::TimerTick);
connect
(timEndTick,&QTimer::timeout,
this
,&Track::EndSlide);
SecsTxt =
new
QCPItemText
(
this
);
SecsTxt->
setPositionAlignment
(Qt::AlignTop|Qt::AlignLeft);
SecsTxt->
position
->
setType
(QCPItemPosition::ptViewportRatio);
SecsTxt->
position
->
setCoords
(
0.02
,
0.05
);
SecsTxt->
setText
(
"
Ready
"
);
SecsTxt->
setFont
(
QFont
(
font
().
family
(),
10
));
SecsTxt->
setColor
(
QColor
(
255
,
255
,
255
));
SecsTxt->
setClipToAxisRect
(
false
);
DoSlide =
false
;
//
wavePlot->setPen(ThePen);
}
Track::~Track
()
{
delete
decoder;
//
wavePlot delete auto ?
}
void
Track::setSource
(
const
QAudioBuffer &inbuffer)
{
buffer = inbuffer;
setBuffer
();
startPlaying
(((
float
)buffer.
duration
()) /
1e+6
);
}
void
Track::setBuffer
()
{
samples.
clear
();
qreal peak =
getPeakValue
(buffer.
format
());
const
float
*data = buffer.
constData
<
float
>();
int
count = buffer.
sampleCount
();
for
(
int
i=
0
; i<count; i +=
2
){
double
val = ((
double
)data[i])/peak;
samples.
append
(val);
}
}
void
Track::plot
()
{
QVector<
double
>
x
(samples.
size
());
for
(
int
i=
0
; i<x.
size
(); i++)
x[i] = i;
wavePlot->
addData
(x, samples);
yAxis->
setRange
(
QCPRange
(-
1.0
,
1.0
));
xAxis->
setRange
(
QCPRange
(
0
, samples.
size
()));
replot
();
}
void
Track::startPlaying
(
float
TimeInSecs)
{
//
TickAdd = 1.f/( TimeInSecs / 0.025f );
TotSecs = TimeInSecs;
timGenericTick->
start
();
timEndTick->
start
((
int
)(TimeInSecs *
1000
));
}
void
Track::TimerTick
()
{
if
(!DoSlide)
return
;
float
RemSecs = ((
float
)timEndTick->
remainingTime
()) /
1000
.
f
;
float
CurrentPos = TotSecs - RemSecs;
TickSet = CurrentPos/TotSecs;
PlayRect->
topLeft
->
setCoords
(TickSet,
0
);
SetTimeLabel
(CurrentPos,TotSecs);
layer
(
"
Playing
"
)->
replot
();
}
void
Track::EndSlide
()
{
timGenericTick->
stop
();
timEndTick->
stop
();
PlayRect->
topLeft
->
setCoords
(
1
,
0
);
SetTimeLabel
(TotSecs,TotSecs);
layer
(
"
Playing
"
)->
replot
();
}
void
Track::SetTimeLabel
(
float
Cur,
float
Remaining)
{
SecsTxt->
setText
(
QString::number
(Cur,
'
f
'
,
1
) +
"
/
"
+
QString::number
(Remaining,
'
f
'
,
1
) +
"
(sec)
"
);
}
/*
*
* https://stackoverflow.com/questions/46947668/draw-waveform-from-raw-data-using-qaudioprobe
* @brief Track::getPeakValue
* @param format
* @return The peak value
*/
qreal
Track::getPeakValue
(
const
QAudioFormat& format)
{
//
Note: Only the most common sample formats are supported
if
(!format.
isValid
())
return
qreal
(
0
);
if
(format.
codec
() !=
"
audio/pcm
"
)
return
qreal
(
0
);
switch
(format.
sampleType
()) {
case
QAudioFormat::Unknown:
break
;
case
QAudioFormat::Float:
if
(format.
sampleSize
() !=
32
)
//
other sample formats are not supported
return
qreal
(
0
);
return
qreal
(
1.00003
);
case
QAudioFormat::SignedInt:
if
(format.
sampleSize
() ==
32
)
#
ifdef
Q_OS_WIN
return
qreal
(
INT_MAX
);
#
endif
#
ifdef
Q_OS_UNIX
return
qreal
(
SHRT_MAX
);
#
endif
if
(format.
sampleSize
() ==
16
)
return
qreal
(
SHRT_MAX
);
if
(format.
sampleSize
() ==
8
)
return
qreal
(
CHAR_MAX
);
break
;
case
QAudioFormat::UnSignedInt:
if
(format.
sampleSize
() ==
32
)
return
qreal
(
UINT_MAX
);
if
(format.
sampleSize
() ==
16
)
return
qreal
(
USHRT_MAX
);
if
(format.
sampleSize
() ==
8
)
return
qreal
(
UCHAR_MAX
);
break
;
}
return
qreal
(
0
);
}
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